BitConverter.ToDouble Method (Byte[], Int32)
.NET Framework (current version 2016)
Returns a double-precision floating point number converted from eight bytes at a specified position in a byte array.
Assembly: mscorlib (in mscorlib.dll)
Parameters
- value
- Type: System.Byte[]An array of bytes.
- startIndex
- Type: System.Int32The starting position within value.
Return Value
Type: System.DoubleA double precision floating point number formed by eight bytes beginning at startIndex.| Exception | Condition |
|---|---|
| ArgumentException |
startIndex is greater than or equal to the length of value minus 7, and is less than or equal to the length of value minus 1.
|
| ArgumentNullException |
value is null.
|
| ArgumentOutOfRangeException |
startIndex is less than zero or greater than the length of value minus 1.
|
The ToDouble method converts the bytes from index startIndex to startIndex + 7 to a Double
value. The order of bytes in the array must reflect the endianness of
the computer system's architecture; for more information, see the
Remarks section of the BitConverter class topic.
The following code example converts elements of Byte arrays to Double values with the ToDouble method.
// Example of the BitConverter.ToDouble method C#. using System; class BytesToDoubleDemo { const string formatter = "{0,5}{1,27}{2,27:E16}"; // Convert eight byte array elements to a double and display it. public static void BAToDouble( byte[ ] bytes, int index ) { double value = BitConverter.ToDouble( bytes, index ); Console.WriteLine( formatter, index, BitConverter.ToString( bytes, index, 8 ), value ); } // Display a byte array, using multiple lines if necessary. public static void WriteMultiLineByteArray( byte[ ] bytes ) { const int rowSize = 20; int iter; Console.WriteLine( "initial byte array" ); Console.WriteLine( "------------------" ); for( iter = 0; iter < bytes.Length - rowSize; iter += rowSize ) { Console.Write( BitConverter.ToString( bytes, iter, rowSize ) ); Console.WriteLine( "-" ); } Console.WriteLine( BitConverter.ToString( bytes, iter ) ); Console.WriteLine( ); } public static void Main( ) { byte[ ] byteArray = { 0, 0, 0, 0, 0, 0, 0, 0, 240, 63, 0, 0, 0, 0, 0, 224, 111, 64, 0, 0, 224, 255, 255, 255, 239, 65, 0, 0, 0, 0, 0, 0, 112, 63, 0, 0, 0, 0, 0, 0, 240, 61, 223, 136, 30, 28, 254, 116, 170, 1, 250, 89, 140, 66, 202, 192, 243, 63, 251, 89, 140, 66, 202, 192, 243, 63, 252, 89, 140, 66, 202, 192, 243, 63, 82, 211, 187, 188, 232, 126, 61, 126, 255, 255, 255, 255, 255, 255, 239, 255, 255, 255, 255, 255, 255, 239, 127, 1, 0, 0, 0, 0, 0, 0, 0, 248, 255, 0, 0, 0, 0, 0, 0, 240, 255, 0, 0, 0, 0, 0, 0, 240, 127 }; Console.WriteLine( "This example of the BitConverter.ToDouble( byte[ ], " + "int ) \nmethod generates the following output. It " + "converts elements \nof a byte array to double values.\n" ); WriteMultiLineByteArray( byteArray ); Console.WriteLine( formatter, "index", "array elements", "double" ); Console.WriteLine( formatter, "-----", "--------------", "------" ); // Convert byte array elements to double values. BAToDouble( byteArray, 0 ); BAToDouble( byteArray, 2 ); BAToDouble( byteArray, 10 ); BAToDouble( byteArray, 18 ); BAToDouble( byteArray, 26 ); BAToDouble( byteArray, 34 ); BAToDouble( byteArray, 42 ); BAToDouble( byteArray, 50 ); BAToDouble( byteArray, 58 ); BAToDouble( byteArray, 66 ); BAToDouble( byteArray, 74 ); BAToDouble( byteArray, 82 ); BAToDouble( byteArray, 89 ); BAToDouble( byteArray, 97 ); BAToDouble( byteArray, 99 ); BAToDouble( byteArray, 107 ); BAToDouble( byteArray, 115 ); } } /* This example of the BitConverter.ToDouble( byte[ ], int ) method generates the following output. It converts elements of a byte array to double values. initial byte array ------------------ 00-00-00-00-00-00-00-00-F0-3F-00-00-00-00-00-E0-6F-40-00-00- E0-FF-FF-FF-EF-41-00-00-00-00-00-00-70-3F-00-00-00-00-00-00- F0-3D-DF-88-1E-1C-FE-74-AA-01-FA-59-8C-42-CA-C0-F3-3F-FB-59- 8C-42-CA-C0-F3-3F-FC-59-8C-42-CA-C0-F3-3F-52-D3-BB-BC-E8-7E- 3D-7E-FF-FF-FF-FF-FF-FF-EF-FF-FF-FF-FF-FF-FF-EF-7F-01-00-00- 00-00-00-00-00-F8-FF-00-00-00-00-00-00-F0-FF-00-00-00-00-00- 00-F0-7F index array elements double ----- -------------- ------ 0 00-00-00-00-00-00-00-00 0.0000000000000000E+000 2 00-00-00-00-00-00-F0-3F 1.0000000000000000E+000 10 00-00-00-00-00-E0-6F-40 2.5500000000000000E+002 18 00-00-E0-FF-FF-FF-EF-41 4.2949672950000000E+009 26 00-00-00-00-00-00-70-3F 3.9062500000000000E-003 34 00-00-00-00-00-00-F0-3D 2.3283064365386963E-010 42 DF-88-1E-1C-FE-74-AA-01 1.2345678901234500E-300 50 FA-59-8C-42-CA-C0-F3-3F 1.2345678901234565E+000 58 FB-59-8C-42-CA-C0-F3-3F 1.2345678901234567E+000 66 FC-59-8C-42-CA-C0-F3-3F 1.2345678901234569E+000 74 52-D3-BB-BC-E8-7E-3D-7E 1.2345678901234569E+300 82 FF-FF-FF-FF-FF-FF-EF-FF -1.7976931348623157E+308 89 FF-FF-FF-FF-FF-FF-EF-7F 1.7976931348623157E+308 97 01-00-00-00-00-00-00-00 4.9406564584124654E-324 99 00-00-00-00-00-00-F8-FF NaN 107 00-00-00-00-00-00-F0-FF -Infinity 115 00-00-00-00-00-00-F0-7F Infinity */
Universal Windows Platform
Available since 8
.NET Framework
Available since 1.1
Portable Class Library
Supported in: portable .NET platforms
Silverlight
Available since 2.0
Windows Phone Silverlight
Available since 7.0
Windows Phone
Available since 8.1
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